Late resonant response at Texcoco, Valley of Mexico, during distant earthquakes |
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Authors: | WR Stephenson Cinna Lomnitz Hortencia Flores |
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Institution: | aInstitute of Geological and Nuclear Sciences Ltd., P.O. Box 30-368, Lower Hutt, New Zealand;bInstituto de Geofísica, UNAM, Apdo. Postal 70-472, Coyoacán, 04510 México D.F., Mexico |
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Abstract: | Recordings of the ground motion induced by two shallow (15–25 km deep), distant (300 and 605 km) earthquakes made on deep, soft lacustrine sediments at Texcoco, Valley of Mexico, show a late monochromatic response at 0.48 Hz. Data from a strong-motion recorder array show that this late response is consistent with slow (60 m/s group velocity) Rayleigh waves generated near the 6 km distant soft/stiff soil interface of the ex-lake surface margin. It is concluded that the excitation of local Rayleigh waves in soft soil deposits by arriving earthquake ground motion provides one mechanism to explain the prolonged duration of resonant motion on soft soils, and hence the extreme damage often associated with soft soils responding to distant earthquakes. |
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